File:The biology of the amphibia (1931) (20194317440).jpg

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Title: The biology of the amphibia
Identifier: biologyofamphibi00nobl (find matches)
Year: 1931 (1930s)
Authors: Noble, Gladwyn Kingsley, 1894-1940
Subjects: Amphibians
Publisher: New York : McGraw-Hill
Contributing Library: ASC - York University Libraries
Digitizing Sponsor: York University - University of Toronto Libraries

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274 THE BIOLOGY OF THE AMPHIBIA the mesonephric tubules fail to reach the Wolffian duct but extend posteriorly to empty independently into the cloaca. Yamagiva (1924) has shown this to be the condition in both sexes of Megalobatrachus and in the male Hynobius. In the
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Fig. 99.—The vasa efferentia of Ascaphus. The Wolffian duct of the right kidney has been injected with ink. Transverse ducts connect the vasa effer- entia of the one side with a longitudinal canal of the opposite kidney. Hence ink injected into the right Wolffian duct makes its way into the vasa efferentia of the opposite kidney. W.D., Wolffian duct; M.D., Mullerian duct; V.E., vasa efferentia; L.C., longitudinal canal; T, right testis; F.B., fat body. female a few of the tubules empty into the Wolffian duct, while others open into the cloaca. It is remarkable that in the closely related Onychodactylus some of the tubules of the male fuse to form a common duct opening into the cloaca, while others join the Wolffian duct. Onychodactylus has been derived from Hyno- bius and yet it shows a theoretically more primitive condition

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  • bookid:biologyofamphibi00nobl
  • bookyear:1931
  • bookdecade:1930
  • bookcentury:1900
  • bookauthor:Noble_Gladwyn_Kingsley_1894_1940
  • booksubject:Amphibians
  • bookpublisher:New_York_McGraw_Hill
  • bookcontributor:ASC_York_University_Libraries
  • booksponsor:York_University_University_of_Toronto_Libraries
  • bookleafnumber:292
  • bookcollection:YorkUniversity
  • bookcollection:ontario_council_university_libraries
  • bookcollection:toronto
  • BHL Collection
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7 August 2015

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This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.

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This image was originally posted to Flickr by Internet Archive Book Images at https://flickr.com/photos/126377022@N07/20194317440. It was reviewed on 27 September 2015 by FlickreviewR and was confirmed to be licensed under the terms of the No known copyright restrictions.

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